Engine noise coming from a shutoff engine

[tjsouth51]

A noise that just started happening on my 23’ Tremore engine after it has been shut down for a period of an hour or two. I’ve recorded the buzzing noise and I’ve taken it to the dealer twice and it won’t make the noise even though I’ve given the techs a copy of my video.

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[Msfitoy]

 

[RedDakooter05]

why kind of noise is it making?

 

[GitRDone]

https://www.ranger5g.com/forum/threads/mystery-sound.16593/

 

[airline tech]

Post the recording, it is possibly the sound of the of the TCU powering up the modules for a Communication Check-Up from Ford Pass.
It does this from time to time and also IF the Sync is set to Auto Update it will attempt to connect to WI-FI and connect or ATTEMPT to update - OTA, Note I am stressing ATTEMPT.

Plus: If your phone is near the truck, sometimes it will self-communicate and prep for an intended engine start.
Proximity of your Phone to the Truck is the Key Factor
This, powers up the Wake Circuit and the Low Press fuel pump will prime, and the Waste Gate Actuator will cycle - Just like it does when you open the driver's door.

Testing so far shows that the FOB itself does not cause this, it's only when the Phone is is proximity of the truck for the Full On - wake Up cycle.

I will say that if you look at the Ford Pass App, it communicates at periods when you are not driving or around the truck.
As noted via the Vehicle Tab within the App, from time to time you will see Last Updated at a time when you were asleep or at work and nowhere near the truck.


I dug into this as just after purchase as I was spraying Fluid Film (Anti-Corrosion)
and this sound started, it was unexpected and unknown what the heck it was at the time, but let's just say within 2 seconds I went from being on my back to standing upright beside the truck.

This is the Wastegate Actuator - Cycle when the Driver's Door is opened. (Wake Up Circuit)
Triggered by the Courtesy Lights powering on via the Door Ajar Switch

As viewed from the Passenger Side - Wheel Well

I have a hunch this is the sound you are hearing and would explain why it did not do it while at the Dealer, Your Phone was not near the truck.

 

[tjsouth51]

why kind of noise is it making?

Post the recording, it is possibly the sound of the of the TCU powering up the modules for a Communication Check-Up from Ford Pass.
It does this from time to time and also IF the Sync is set to Auto Update it will attempt to connect to WI-FI and connect or ATTEMPT to update - OTA, Note I am stressing ATTEMPT.

Plus: If your phone is near the truck, sometimes it will self-communicate and prep for an intended engine start.
Proximity of your Phone to the Truck is the Key Factor
This, powers up the Wake Circuit and the Low Press fuel pump will prime, and the Waste Gate Actuator will cycle - Just like it does when you open the driver's door.

Testing so far shows that the FOB itself does not cause this, it's only when the Phone is is proximity of the truck for the Full On - wake Up cycle.

I will say that if you look at the Ford Pass App, it communicates at periods when you are not driving or around the truck.
As noted via the Vehicle Tab within the App, from time to time you will see Last Updated at a time when you were asleep or at work and nowhere near the truck.


I dug into this as just after purchase as I was spraying Fluid Film (Anti-Corrosion)
and this sound started, it was unexpected and unknown what the heck it was at the time, but let's just say within 2 seconds I went from being on my back to standing upright beside the truck.

This is the Wastegate Actuator - Cycle when the Driver's Door is opened. (Wake Up Circuit)
Triggered by the Courtesy Lights powering on via the Door Ajar Switch

As viewed from the Passenger Side - Wheel Well

I have a hunch this is the sound you are hearing and would explain why it did not do it while at the Dealer, Your Phone was not near the truck.

 

[tjsouth51]

why kind of noise is it making?

I have to shorten the video, it’s too large to post

 

[Grumpaw]

It's your Ranger's "Truck Gnome".....each Ranger has one assigned, and it lives under the dash, but wanders thru the vehicle throughout the day......makes weird noises, sounds, and occasionally parties with other Gnomes when other Ranger's are in the near vicinity.

 

[Rocketeer61]

Oh wow. This would drive me crazy until I figured it out!

 

[tjsouth51]

I have to shorten the video, it’s too large to post

 

[tjsouth51]

I have to shorten the video, it’s too large to post

 

[tjsouth51]

Post the recording, it is possibly the sound of the of the TCU powering up the modules for a Communication Check-Up from Ford Pass.
It does this from time to time and also IF the Sync is set to Auto Update it will attempt to connect to WI-FI and connect or ATTEMPT to update - OTA, Note I am stressing ATTEMPT.

Plus: If your phone is near the truck, sometimes it will self-communicate and prep for an intended engine start.
Proximity of your Phone to the Truck is the Key Factor
This, powers up the Wake Circuit and the Low Press fuel pump will prime, and the Waste Gate Actuator will cycle - Just like it does when you open the driver's door.

Testing so far shows that the FOB itself does not cause this, it's only when the Phone is is proximity of the truck for the Full On - wake Up cycle.

I will say that if you look at the Ford Pass App, it communicates at periods when you are not driving or around the truck.
As noted via the Vehicle Tab within the App, from time to time you will see Last Updated at a time when you were asleep or at work and nowhere near the truck.


I dug into this as just after purchase as I was spraying Fluid Film (Anti-Corrosion)
and this sound started, it was unexpected and unknown what the heck it was at the time, but let's just say within 2 seconds I went from being on my back to standing upright beside the truck.

This is the Wastegate Actuator - Cycle when the Driver's Door is opened. (Wake Up Circuit)
Triggered by the Courtesy Lights powering on via the Door Ajar Switch

As viewed from the Passenger Side - Wheel Well

I have a hunch this is the sound you are hearing and would explain why it did not do it while at the Dealer, Your Phone was not near the truck.

 

[airline tech]

Ok, we have verified Grumpaw's Gnome is paying you a visit.

Now to isolate where it is coming from.

I hear rain in the background and focusing on the Whistle Sound

To me the sound appears to be an actuator moving (Something Metalic) Resonance
So, ref my video and see if the Wastegate Actuator is moving when it does this

But:

Due to the high pitch decibel of the sound, it sounds like the Car Horn or Alarm Horn is partially sounding with a small amount of voltage being applied.

Try this:
Just for a quick check if it makes any noted change.

When it's doing this every 15 Seconds or so.
Take the FOB and press the door lock button (2-Times) to activate the door lock feedback confirmation horn trigger. You should get a Quick Double Honk
or
Press the Panic Button on the FOB to get the Car Horn to sound off.

Try this with Driver's Window Down

Reach in and Press the Car Horn on the Steering Wheel

Now let's test the Car Alarm Horn

With Driver's window down and truck locked and FOB and Phone away from the truck.
Reach in and open the Driver's Door from the inside handle.
This will trigger the Anti-Theft Alarm
You will need to go back inside the house and get the FOB and press the Unlock Button to reset the alarm or start the truck.

For Ref:
Both Horns are located by the Driver's Side headlight assembly
Car Horn = Double Horn Assembly
Alarm Horn = Single Horn Assembly

One other thing I can think of that could possibly be triggering that sound would be in the VCT - Variable Camshaft Timing solenoids trying to activate without oil pressure to move the actuators.

VCT - Solenoid Location

Another Possible that comes to mind would be the Cabin Coolant Heat Pump

This Pump activates when the ASS is active and you have heat selected, this keeps the Coolant Flow through the Heater Core with the engine off (ASS Active and Engine Off)

Cabin Control Heat Pump - Location

Another possible would be the HP Fuel Pump, now the HP Pump itself is driven by the Camshaft but the LP Fuel Pump (Electric) may be triggering on and trying to Prime the Fuel Rail in a non-normal manner, and the sound may be the fuel rail dumping excess pressure.
So, the command for the Fuel Pump Prime circuit may be stuck in Prime.

HP Fuel Pump - Location

I tried to imagine everything possible that would be attempting to power and MOVE or PRESSURIZE in a Non-Normal situation and produce a sound.

The above is all that come to mind at the moment.

Your best option to locate the sound is to get a mechanics stethoscope and attempt to locate where the Gnome is hiding and inform him Grumpaw needs to have a long talk with him.

I will say this is a baffling noise, but just needs a little help in pinpointing it down.

Keep us posted on what you find.

 

[ROBERTECOX]

Holy crap!!! it's CHRISTINE!!!!

 

[gwhalin]

Mine does this as well (posted a video here while back). I never figured it out and I just stopped worrying about it. Still does it though so if you ever find it let me know!

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